Characteristics of Life Flashcards
What is a tissue
A group of cells that perform a common function
What is an organ
A group of tissues that perform a common function
What is an organ system
A group of organs that perform a common function
What are the characteristics of life
Movement Respiration Sensitivity Growth Reproduction Excretion Nutrition
Movement
Action by an organism or part of an organism causing a change in position or place
Respiration
Releasing energy in cells
Sensitivity
Organism is able to react and are aware of surroundings
Growth
A permanent increase in size by an increase in a number of cells and tissues
Reproduction
Reproducing offspring to keep the species not drying out
Excretion
The removal of harmful substances which can damage/ kill living cells
Nutrition
Intake of nutrients and energy for respiration and growth
5 kingdoms
Plants Animals Fungi Protoctists Bacteria (prokaryotes)
Plants (4)
Multicellular
Cells have chloroplasts
Cell was made of cellulose
Stores glucose as starch
Animals (5) two types of them
Multicellular Stores sugar as glycogen No cell walls Don't contain chloroplasts Have a nervous system
Vertebrates - have back bones
Invertebrates - lack a back bone
Fungi (6)
Multicellular/ unicellular Cells wall made of chitin Made of fibres called mycelium Feed by saprophytic nutrition using extracellular enzymes Store carbohydrates as glycogen Don't contain chloroplasts
Protoctists (3 + example)
Single cellular
Contains chloroplasts
Can cause disease
E.g. Amoeba, algae
Bacteria/ prokaryotes (6 + example)
Small single celled
Cell wall made of polysaccharides and proteins
No nucleus
Have a bacterial chromosome (DNA)
Most are saprophytes
Some contain plasmids, flagella, slime layer
E.g. Ecoli
Autotrophic + example
Make their own food
Plants photosynthesise
Heterotrophic + example
Get their nutrients from feeding on other organisms
Animals
Saprophytic + example
Food is digested extracellularly by enzymes from dead/ rotten organisms
Fungi
What is mycelium
A network of hyphae which are thread like filaments that release enzymes and absorb nutrients
What are plasmids
Loops of DNA sometimes found in bacteria used for genetic engineering
What is a pathogen + examples of kingdoms
Something that causes disease
Fungi
Bacteria
Protoctists
Viruses (3)
All are parasites and pathogens
Made of protein coat and genetic material
Not made of cells with nucleus or cytoplasm
Not living - can’t Mrs gren
